Recirculation MERCEDES-BENZ C240 2002 W203 Owner's Manual

154 Climate control
Te ch n i c a l
data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index
Display and controls
1Air volume
2Temperature control, left
3Temperature control, right
4Air distribution control switch5Rear window defroster, see page 170
6Economy mode, see page 159
Residual engine heat utilization, see page 159
7Air distribution and air volume (automatic)
8Air recirculation, see page 167
9Defrosting, see page 157
Important!
This vehicle is equipped with an air conditioning
system that uses R-134a (HFC: hydrofluorocarbon) as a
refrigerant. Repairs should always be performed by a
qualified technician, and refrigerant should be collected
in a recovery system for recycling.
P 83.30-3425-26
OM_203.book Seite 154 Donnerstag, 31. Mai 2001 11:57 11

157 Climate control
Te ch n i c a l
data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index Defrosting
Press the P button. The indicator lamp in the button
illuminates.
Switch off air recirculation, if selected. Press
buttonO, the indicator lamp in the button will go
out.
Close center air outlets.
Turn wheels (8, page 152) up to open left and right side
air outlets (9, page 152). Adjust side air outlets upward.
Pressing the switch again returns the system to the
previous setting.Windows fogged up on the inside
Switch off the economy mode, if selected. Press
buttonS. The indicator lamp in the button will go
out.
Switch off air recirculation, if selected. Press
buttonO. The indicator lamp in the button will go
out.
Set blower to the maximum blower speed.
Press the P button. The indicator lamp in the button
illuminates.
Increase temperature setting.
Open the side air outlets (9, page 152) and direct them
onto the side windows.
Windshield fogged up on the outside
Switch on the windshield wiper.
Close air outlet at dashboard top center (7, page 152).
Switch to manual mode.
Turn air distribution control switch to positionh
ork.
OM_203.book Seite 157 Donnerstag, 31. Mai 2001 11:57 11

158 Climate control
Te ch n i c a l
data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index
Air recirculation
Select air recirculation:
The indicator lamp in the O button is not
illuminated.
Press button O briefly. The indicator lamp in the
button illuminates.
To switch off the air recirculation:
The indicator lamp in the O button is illuminated.
Press button O briefly. The indicator lamp in the
button goes out.
Switching on air recirculation and activating
convenience closing of power windows and sliding /
pop-up roof:
The indicator lamp in the O button is not
illuminated.
Press button O for more than 2 seconds, the side
windows and the sliding / pop-up roof will be closed. The
indicator lamp in the button illuminates.Switching off air recirculation and activating
convenience opening:
The indicator lamp in the O button is illuminated.
Press button O for more than 2 seconds, the side
windows and the sliding / pop-up roof return to the
position they were in before closing.
A window or the sliding / pop-up roof opened manually
after convenience closing will no longer be returned to
the position it was in before closing when convenience
opening is selected.
The system automatically switches from air
recirculation to fresh air:
•after 30 minutes if the outside temperature is above
about 40
°F(5
°C),
•after 5 minutes if the outside temperature is below
about 40
°F(5
°C),
•after 5 minutes if economy mode S is selected.
The system switches automatically to air recirculation at
high outside temperatures. A quantity of outside air is
added after a maximum of 30 minutes.
If the windows should fog up from the inside, switch
from recirculated air back to fresh air.
OM_203.book Seite 158 Donnerstag, 31. Mai 2001 11:57 11

162 Automatic climate control
Te ch n i c a l
data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index
Display and controls
1Temperature control, left, lowering
2Temperature control, left, raising
3Air distribution control switch left (automatic,
manual operation)
4Activated charcoal filter, see page 168
5Display
6Air distribution control switch right (automatic,
manual operation)7Temperature control, right, raising
8Temperature control, right, lowering
9Rear window defroster, see page 170
10Economy mode, see page 169
Residual engine heat utilization, see page 169
11Air volume control +
switch on system
12Air volume control -
switch off system
13Air recirculation, see page 167
14Defrosting, see page 166
Important!
This vehicle is equipped with an air conditioning
system that uses R-134a (HFC: hydrofluorocarbon) as a
refrigerant. Repairs should always be performed by a
qualified technician, and refrigerant should be collected
in a recovery system for recycling.
P 83.40-2265-26
OM_203.book Seite 162 Donnerstag, 31. Mai 2001 11:57 11

164 Automatic climate control
Te ch n i c a l
data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index
Notes:
Do not obstruct the air f low by placing objects on the air
flow-through exhaust slots below the rear window.
Also keep the air intake grill in front of the windshield
free of snow and debris.
The storage compartment between the front seats can be
ventilated. See page 171 for notes on ventilating the
storage space under the armrest in the center console.
The air conditioner switches itself off for its own
protection if refrigerant is lost. No cooling will then take
place. Economy mode S can n ot be s witched of f. Have
the air conditioner checked by a Mercedes-Benz Center
should this happen.
If the vehicle interior has been heated by direct sunlight
and is very hot, ventilate the interior (open door or
windows for a short period) before driving off.
Dust filter
Nearly all dust particles and pollen are filtered out
before outside air enters the passenger compartment
through the air distribution system.Basic setting – automatic mode
In the automatic mode the automatic climate control
cools or heats the interior depending on the direction
and strength of the sunlight, outside temperature and
the selected interior temperature of the vehicle. With
the automatic mode switched off, the air volume and
distribution can still be set manually.
Briefly press left or right U button. The h, j
and k symbols will no longer be visible.
The economy mode and air recirculation functions will
be switched off. The automatic blower will be activated
at the same time.
We recommend to set the temperature switches on the
left and right to 72
°F (22
°C). Please make changes from
this setting to suit your personal requirements.
Heating mode:
To lower headroom temperature, use thumbwheel
(4, page 160).
Air conditioning mode:
Open air outlets at dashboard top center (7, page 160)
for an even air distribution.
OM_203.book Seite 164 Donnerstag, 31. Mai 2001 11:57 11

166 Automatic climate control
Te ch n i c a l
data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index
Defrosting
Press the P button. The indicator lamp in the button
illuminates.
Maximum heated and automatically controlled amount
of air is directed to the defroster and windshield air
outlets.
Switch off air recirculation, if selected: Press
buttonO. The indicator lamp in the button will go
out.
The fan is set to a higher speed and the warm air is
directed to the defroster and windshield air outlets.
Pressing the P button again returns the system to
the previous setting.Windows fogged up on the inside
Switch off the economy mode, if selected:
Press buttonS. The indicator lamp in the button will
go out.
Switch off air recirculation, if selected:
Press buttonO. The indicator lamp in the button will
go out.
Set blower to the maximum blower speed.
Increase temperature setting.
Open the side air outlets and direct them onto the side
windows.
Windshield fogged up on the outside
Switch on the windshield wiper.
Close air outlet at dashboard top center (7, page 160).
Switch to manual mode.
Turn air distribution control switch to positionh
ork.
OM_203.book Seite 166 Donnerstag, 31. Mai 2001 11:57 11

167 Automatic climate control
Te ch n i c a l
data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index Air recirculation
Select air recirculation:
The indicator lamp in the button O is not
illuminated.
Press button O briefly. The indicator lamp in the
button illuminates.
To switch off the air recirculation:
The indicator lamp in the button O is illuminated.
Press button O briefly. The indicator lamp in the
button goes out.
Switching on air recirculation and activating
convenience closing of power windows and sliding /
pop-up roof:
The indicator lamp in the button O is not
illuminated.
Press button O for more than 2 seconds, the side
windows and the sliding / pop-up roof will be closed. The
indicator lamp in the button illuminates.Switching off air recirculation and activating
convenience opening:
The indicator lamp in the button O is illuminated.
Press button O for more than 2 seconds, the side
windows and the sliding / pop-up roof return to the
position they were in before closing.
A window or the sliding / pop-up roof opened manually
after convenience closing will no longer be returned to
the position it was in before closing when convenience
opening is selected.
The system automatically switches from air
recirculation to fresh air:
•after 30 minutes if the outside temperature is above
about 40
°F(5
°C),
•after 5 minutes if the outside temperature is below
about 40
°F(5
°C),
•after 5 minutes if economy mode S is selected.
The system switches automatically to air recirculation at
high outside temperatures. A quantity of outside air is
added after a maximum of 30 minutes.
If the windows should fog up from the inside, switch
from recirculated air back to fresh air.
OM_203.book Seite 167 Donnerstag, 31. Mai 2001 11:57 11

168 Automatic climate control
Te ch n i c a l
data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index
Activated charcoal filter
An activated charcoal filter markedly reduces bad odors
and removes pollutants from air entering the passenger
compartment.
Select activated charcoal filter:
The indicator lamp in the button e is not
illuminated.
Press e button briefly. The indicator lamp in the
button illuminates.
Switch off activated charcoal filter:
The indicator lamp in the button e is illuminated.
Press e button briefly. The indicator lamp in the
button goes out.
The system switches automatically to the air
recirculation mode, if the carbon monoxide (CO) or
nitrogen oxides (NO
X) concentration of the outside air
increases beyond a predetermined level.
The automatic air recirculation mode does not function
if economy mode S is selected or if the outside
temperature has fallen below 40
°F(5
°C). The activated charcoal filter should be switched off
when windows fog up on the inside, or if the passenger
compartment needs to be quickly heated or cooled
down.
Switching on the activated charcoal filter and activating
convenience closing of power windows and sliding /
pop-up roof:
The indicator lamp in the e button is not
illuminated.
Press button e for more than 2 seconds, the side
wi nd ows and t he slid in g / p op-up r oof will b e c los ed . The
indicator lamp in the button illuminates.
Switching off activated charcoal filter and activating
convenience opening:
The indicator lamp in the e button is illuminated.
Press button e for more than 2 seconds, the side
windows and the sliding / pop-up roof return to the
position they were in before closing. The indicator lamp
in the button goes out.
A window or the sliding / pop-up roof opened manually
after convenience closing will no longer be returned to
the position it was in before closing when convenience
opening is selected.
OM_203.book Seite 168 Donnerstag, 31. Mai 2001 11:57 11

389 Index
Te ch n i c a l
data Instruments
and controlsOperation DrivingInstrument
cluster displayPractical hints Car careIndex
Index
AAdding engine oil .......................................................... 321
Airbags .............................................................................. 73
ANTILOCK BRAKE SYSTEM
Malfunction and warning message ........................ 297
Antilock brake system (ABS) ....................................... 276
Antitheft alarm system ................................................... 46
Ashtrays .......................................................................... 213
Audio system
Button and soft key operation ..................................176
Cassette mode ........................................................... 182
CD changer ................................................................ 187
CD mode ..................................................................... 186
Operating and display elements ............................. 174
Operating safety ........................................................ 173
Operation ....................................................................176
Operation Audio and telephone .............................. 173
Radio mode ................................................................ 179
Telephone operation ................................................. 190Audio systems ................................................................. 108
Cassette player .......................................................... 110
CD Player .................................................................... 109
Radio ........................................................................... 108
Automatic central locking .............................................. 40
Automatic climate control ............................................ 160
Activated charcoal filter ........................................... 168
Adjustable air outlets,
rear passenger compartment ............................. 172
Air recirculation ........................................................ 167
Air volume, manual .................................................. 165
Basic setting ............................................................... 164
Defrosting ................................................................... 166
Display and controls ................................................. 162
Dust filter ................................................................... 164
Economy mode .......................................................... 169
Front center console
storage compartment ventilation ....................... 171
Residual engine heat utilization ............................. 169
Special settings ......................................................... 165
Windows fogged up on the outside ........................ 166
Automatic transmission ................................................251
Fluid level .................................................................. 322
Transmission selector lever,
manually unlocking ............................................ 350
OM_203.book Seite 389 Donnerstag, 31. Mai 2001 11:57 11

390 Index
Te ch n i c a l
data Instruments
and controlsOperation DrivingInstrument
cluster displayPractical hints Car careIndex
BBabySmart
TM airbag deactivation system ..................... 70
Battery .............................................................................342
Block heater .................................................................... 270
Brake assist system (BAS) ............................................ 275
Bulbs
See Replacing bulbs ................................................. 351
CCD changer
See CD changer installed ......................................... 187
Cellular telephone ......................................................... 224
Center console .................................................................. 24
Central locking switch .................................................... 39
Central locking system ................................................... 31
Automatic central locking ......................................... 40
Central locking switch ............................................... 39
Choosing global or selective mode ........................... 33
Doors ............................................................................. 37
General notes ............................................................... 30
Locking and unlocking with remote control .......... 33
Mechanical keys .......................................................... 36
Obtaining replacement keys ..................................... 29Summer opening/convenience feature ...................35
Vehicle keys ................................................................. 28
Check regularly and before a long trip ...................... 284
Child seat
See Infant and child restraint systems .................... 83
Climate control ............................................................... 152
Adjustable air outlets,
rear passenger compartment ............................. 172
Air recirculation ........................................................ 158
Basic setting ............................................................... 156
Defrosting ................................................................... 157
Display and controls ................................................. 154
Dust filter ................................................................... 155
Economy mode .......................................................... 159
Front center console
storage compartment ventilation ....................... 171
Residual engine heat utilization ............................. 159
Special settings ......................................................... 156
Windows fogged up on the inside .......................... 157
Windows fogged up on the outside ................ 157, 166
COMAND, radio and telephone .................................. 232
Combination switch ....................................................... 148
Control and operation of
radio transmitters .................................................... 232
Coolant level .................................................................. 322
Coolant temperature gauge .......................................... 137
OM_203.book Seite 390 Donnerstag, 31. Mai 2001 11:57 11